David brooks



(NG Model.)

D. BROGKS, Jr.

AIR TIGHT CCVERINC ECR ELECTRIC CABLES.

No. 410,953. PatentedSept. 10, 1889.

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UNITED STATES PATENT OFFICE.

DAVID BROOKS, JR., OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO TIIEELECTRIC CABLE CONSTRUCTION AND MAINTENANCE COMPANY,

OF SAME PLACE.

AIR-TIGHT COVERING FOR ELECTRIC CABLES.

SPECIFICATION forming part of Letters Patent No. 410,953, datedSeptember 10, 1889.

Application filed December 29, 1888. Serial No. 295,110. (No model.)

To @ZZ 107mm it may concern..-

Be it known that I, DAVID BROOKS, Jr., a citizen of the United States,residing in the city and county of Philadelphia, State otl Pennsylvania,have invented a new and useful Improvement in Air-Tight or ProtectiveCoverings for Electric Cables, which improvement is Jfully set forth inthe following speci- Iication and accompanying drawings.

My invention consists ot" a protective covering for an electric cableembodying novel features whereby the cable is rendered impervious tomoisture and air, as will be hereinafter set forth.

Figure l represents a partial side view and partial longitudinal sectionot' an electric cable embodying my invention. Fig. 2 represents apartial side elevation and partial longitudinal section showing themembers of the cable separated.

Similar letters and numerals of reference indicate corresponding' partsin the two iigures.

Referring to the drawings, A designates a bunch of wires which arecovered with cotton or other fibrous material, which is saturated w' 'han insulating substance in a heated or melted condition. lVhile thecable is hot it is covered with a dry powder-such as flour orsoapstone-l`orming a coating or cake Z, which prevents the liquidsubsequently lfrom running.

The cable as prepared new receives its outside covering or incasement,consisting of tin-toil, rubber, and tape successively, as tollows: twostrips of tin-foil 2 3, two strips of rubberi 5, and the exterior tapeor wrapper (l. The Afoil and rubber are wound preferably spiraliy, so asto break joints, or otherwise applied over the respective parts, theexterior tape being braided 'iibrous material suitably painted erprepared with rubber, it being seen that the outside covering` isimpervious to moisture and air, producing superior results in the cable.

In some cases it may be desirable to employ a single layer of tin-foiland of rubber, 0r alternate tin-foil and rubber.

The insulating substance employed may be of any kind. I do not form anyform of insulation for the wires but an air-tight covering composed oftin-foil and rubber vulcanized together, so as to form a solidimpervious mass.

Having thus described my invention, whatl I claim as new, and desire tosecure by Letters Patent, is

l. An electric cable consistingof dry fibrouscovered wires saturatedwith an insulating material and having au incasement of tinfoil andrubber strips vulcanized, substantially as described.

2. An insulated bunch of wires having a covering composed ot' a layerot' tin-toil, an outer covering of rubber, with an exterior wrapping offibrous material having a rubber coating, said parts being combinedsubstantially as described.

3. An electric cable consistingof wires having a iibrous covering with asaturation of insulating material, the latter being provided wit-h adry-powder coating, one or more layers of tin-foil surrounding saidwires, one or more layers of rubber surrounding said tin-foil, and anexterior wrapper of iibrous material having a rubber coating, said partsbeing combined substantially as described.

i. An elect-ric cable composed of fibrouscevered wires saturated withinsulating material and coated with a dry powder, and an incasement oftin-foil and rubber, substantially as described.

5. An electric cable composed of fibrouscovered wires saturated withinsulating material, having an impervious incasement consisting oftin-foil and rubber and an exterior wrapping of painted braid,substantially as described.

DAVID BROOKS, Jn.

Witnesses:

Jol-1N A. WIEDEESHEIM, JAMES F. KELLY.

